Combined typewriting and computing



COMBINED TYPEWRITING AND COMPUTING MACHINE Filed June 22, 1939 3 Sheets-Sheet 1 HENRY L. P/TMAN BY ATTORNEY y 1943- H. L. PITMAN 2,323,622

COMBINED TYPEWHITING AND COMPUTING MACHINE Filed June 22, 1939 a Sheets-Sheet 2 INVQENTOR HENRY L. P/TMAN ATTOFNEY July 6, 1943. 2 H. L PITMAN COMBINED TYPEWRITING AND COMPUTING MACHINE Filed June 22, 1939 3 Sheets-Sheet 3 INVENTOR HENRY L P/TMAN BY m ATTORNEY Patented July 6, 1943 UNITED STATES PATENT OFFICE COMBINED TYPEWRITING AND COMPUTING MACHINE Application June 22, 1939, Serial No. 280,537

6 Claims.

This invention relates to combined typewriting and computing machines in which a general operator is power cycled to actuate reciprocatory computing wheel drivers after the latter have become indexed through operation of typewriter numeral keys, and in which the selection of the drivers to be indexed is under control of the typewriter carriage. The carriage may automatically initiate a power cycle of a general operator, and it may also automatically determine additive or subtractive states of the computing mechanism. Therefore, the carriage traverses and operates control mechanism at one or more computing zones within the range of carriage travel in letter feed or tabulating direction.

More particularly, the invention deals with key-locking mechanism, general-operator cycling mechanism, and carriage-return mechanism, and provides for coordination of these mechanisms one with the other and with other features of the machine.

In prior machines the keys, uch as the numeral type keys, become locked through a camming operation which gets under way only as a cycle of movement of the general-operatoractuated mechanisms gets under wayafter closing a clutch to start the cycle, there is an appreciable interval before the cycle has gotten under way sufiiciently to effect full operation of the key-locking mechanism. Similarly, a cam operation has been employed to open the key-locking mechanism at the end of the cycle and hence there obtained an appreciable time interval between the unlocking of the keys and the end of all movement of the parts cycled by the general operator.

An object of the invention is to provide means whereby the keys become locked before the parts that operate in the cycle can start to move; and a further object is to provide means whereby the unlocking of the keys does not take place before the movement of the cycle-operated parts is suitably concluded. For such purposes a feature of the invention resides in having the mere closing of the clutch operative to actuate the key-locking mechanism to lock the keys; and, conversely, another feature is in having any key. in its operated position, prevent the closing of the clutch.

Another object of the invention is to provide reliably operative yet simple means for effecting coordination of the key-locking mechanism and cycling mechanism and to coordinate such means with a cycling key mechanism, a, creditbalance key mechanism and a power-operable carriage-return mechanism to the end of promoting eflicient operation of these mechanisms and rendering them foolproof.

In respect to the carriage-return mechanism, certain computing-mechanism-control devices, ordinarily traversed by the carriage, are rendered inoperative concomitantly with initiating a power return of the carriage. By initiating a return of the carriage, a cycle of the general operator is also initiated, the general operator mechanism being adapted to restore said control devices during a final portion of the cycle.

Means are employed whereby the cycle may be effected in two stages in order that the final one of these stages, in which said control devices are restored, may be held up so as not to occur until the carriage has been fully returned. An electric motor, for operating the general operator mechanism, may normally be at rest and therefore, when initiating a cycle, a switch is closed concomitantly to start the motor. Such motor tends to race when its load is subnormal. A two stage cycle, as above referred to, may also be used as a single cycle device in conjunction with a manually operable cycling key in that depression of the cycling key effects only the first stage of the cycle and the concluding or cycle-completing stage is effected only by restoration of the key. The motor may be under sub-normal load when the general operator is merely cycled in response to a depression of the cycling key. A further object of the invention, therefore, is to provide for opening the motor circuit at the end of the first stage of the cycle and for reclosing the motor circuit concomitantly with initiating the second stage of the cycle. Thus if the cycling key should be kept depressed after the first stage of the cycle is concluded, the motor current will have become out off and racing of the motor cannot occur.

Other features and advantages will hereinafter appear.

This application is a continuation-in-part of divisional subject-matter of my co-pending application, filed August 1, 1936, now Patent No. 2,178,702, dated November '7, 1939.

In the accompanying drawings:

Figure 1 is a side elevation view of the clutch and dog mechanism.

Figure 2 is a cross sectional side elevation of a combined typewriting and computing machine including mechanism embodying the invention.

Figure 3 is a perspective of mechanism embodying the invention.

Figure 4 is a side view of motor switch contact mechanism.

Figure 5 is a side elevation showing the operation of parts of the key-locking mechanism.

Figure 6 is a rear elevation of the clutch and motor switch mechanism and includes a diagram of the motor circuit.

Figure 7 is a side elevation showing the relative positions of the parts of the clutch mechanism when the cycle has been arrested by the secondary dog device.

Figure 8 is a side elevation showing the operation of the clear-sign printing mechanism relatively to the cycling clutch mechanism.

Referring now more particularly to the drawings, a typewriter unit T surmounts a computing base B. Type actions including numeral-key levers l5 and corresponding type bars l8, are operable to print against a revolvable platen |9 mounted in a letter-feeding carriage guided upon front and rear rails of the typewriter frame. The type actions, through a universal bar 24, actuate escapement dogs relative to an escapement wheel, not shown, having a pinion 26 engagin a letter-feed rack 21 on the carriage. A spring motor 29 partly shown, Figure 2, urges the carriage in letter-feed and tabulating direction. Denominational tabulating key levers 39 may elevate corresponding denominational stop reeds 3| for interception by a tabulating stop 32 on a column unit 33 located on racks 34, 35 carried by the carriage 20. The elevation of any tabulating reed 3| actuates a universal bar 36 and its shaft 31 so that the latter through known connections, not shown, disengages the letter-feed rack 21 from the escapement pinion 26.

At the depression of any numeral key-lever l5, 8. rod 39 pendent therefrom rocks a shaft 40 to depress a corresponding digit bar 4| to depress a corresponding index pin 42 in a computing wheel driver or register bar 43. There are a digit bar 4| and a rock shaft 40, for each digit from 0 to 9 and these are part of the usual unit 44 of pin-setting linkages.

The computing base B may have one or more registers each comprising a set of computing pinions 45 and a corresponding set of the register bars 43 whose racks 46 mesh constantly with corresponding idlers 41. The register bars 43 normally stand with their digit pins 42 slightly to the rear and thus out of the path of descent of the corresponding digit bars 4|. The register bars 43 of a selected register are advanceable seriatim in denominational order to bring their pin 42 under the digit bars 4| for the indexing operation.

A single set of denominational jacks 48 serves for advancing the register bars 43 of an one set to pin-setting position. Cam plates 49 are selectively depressible to connect corresponding sets of register bars to said single set of jacks 48. Cross blades 50 corresponding to the set of jacks extend laterally to the different sets of the register bars 43 which are distributed across the machine. A set of thrust rods 5| abuts the set of jacks 49 and is connected by a set of bell cranks 53, fulcrumed on a rod 54, to a set of master racks connected to said cross blades 50. The latter in turn are connected to sets of distributive racks 52 corresponding to the sets of register bars and having couplers 56 pivoted to their forward ends. A set of the register bars 43 is selected for indexing by raising the companion set of couplers 56 from the normal depressed position, Figure 2, to a position in which the front ends of the couplers are opposite rollers 51 on the register bars. A set of couplers is raised to effective position by depressing the corresponding cam plate 49, and the connections for this purpose include levers 58 on a fulcrum rod 59. Said connections further include a plate 60 and a thrust rod 6| for each cam-plate 49 so that depression of a cam plate 49 effects clockwise (Figure 2) rocking of a corresponding lever 58.

The fulcrum rod 59 is supported by side links 62 depending from horizontal arms 64 fixed to a rock shaft 65. Vertical arms 66 also fixed to said rock shaft support the fulcrum rod 54 for the bell cranks 53. A so fixed to said rock shaft 65 is a latch plate 68 controlled by a latch arm 69 having a yieldable connection 10 to a rock shaft journaled in the framework. By rocking the latching shaft 7| clockwise, Figure 2, its arm 69 is withdrawn from a step of the latch plate 68 whereupon the latter and its shaft 65 may rock clockwise until. a second step of the latch plate 68 stops on the arm 69. Thus the thrust rods 5| and 6| may correspondingly drop. It follows that the set of denominational jacks 48 and cam plates 49 may also drop so as to be inoperative by the column units 33 on the typewriter carriage, each unit having a denomination-selecting tooth 12 and one or more cam-p1ate depressing tappets 13 for traversing and normally actuating said jacks and cam plates.

A register bar actuating cross bar 14 is connected to racks 15 mounted at the sides of the computing base B. A cross shaft Hi is connected by gearing, not shown, to both racks 15 so that the latter move in unison for reciprocating the cross bar 14. In its forward stroke the cross bar 74 engages the index pins 42 that have been set in its path and thereby advances the appropriate register bars 43 for turning the computing pinions 45. The return stroke of the cross bar 14 restores the register bars 43.

A cycling shaft '51, journaled in the framework, has a crank and pitman connection, not shown, to one of the racks 75 so that a full revolution of said shaft T! reciprocates the cross bar 14.

When a set of couplers 5B is elevated to effective position by depression of the corresponding cam plate 49, a latch link 18 is withdrawn from a state-controller bar 19 so that the latter, urged forwardly by a spring 89 assumes an additive po' sition. There is a state-controller bar 79 for each register and its shift to additive position determines, through mechanism not shown, that the corresponding set of computing wheels will be shifted, during the cycle, into and out of mesh with the register bar racks 46. Depression of a subtraction cam plate 82 operates through a plate, like 69, a thrust rod, like El, and further connections, not shown, to rock a shaft 83 counterclock wise to withdraw secondary latches 84 so that any state-controller bar 19, that has been released to additive position, may move farther forward to subtractive position to determine that the corresponding set of computing pinions 45 will be shifted into and out of mesh with the idlers 41 during the cycle.

After the last jack 49 has been actuated by the carriage in a computing zone, a cycling tooth 89 on the column unit 33 passes over and thus will have rocked, within a letter feed step of the can riage, a lever 89 having a connection 99 to a cycling jack, the lower end of which abuts a thrust rod 9| partly shown at Figure 3. Said thrust rod 9| is cormected to a bell crank 92, on the fulcrum rod 54. Said bell crank 92 abuts an arm 93 yoked to an arm 94 which abuts a pin of an arm 85 fixed to a clutch trip-rock shaft 96 journaled in the framework. The yoked arms 93, 94 are supported rotatably loose on a key-lock rock shaft 91 journaled in the framework.

A clutch dog 95 is fixed to the rock shaft 96 and normally engages a latch stud 98 of a plate 99 that, when released, is urged by a sprin M to rotate lirnitedly clockwise, Figure 8, relatively to a plate I00. The plates 99, I have pin-andslot connections 80 which limit the rotation of plate 99 relatively to plate I00. Said plate I00 carries spring-pressed clutch pawls IN and is fixed to the cycling shaft IT. A toothed wheel I02 is normally rotatively loose on the cycling shaft IT and has a worm-and-gear connection I03, Figure 6, to a shaft I04 that is drivable by a motor represented atli i. The toothed wheel I02 is articulated at Iilil to a hub I03 of the worm-gear of said connection. 99 is latched and restrained by the clutch dog 95, it holds the pawls IOI disengaged from the toothed wheel I02 by means of pawl-controlling pins 87 provided on plate 99, Figure 8. But when the plate 99 is released, through retraction of the clutch dog 95, the resulting slight clockwise spring-urged rotation of said plate 99 and correspending recession of the pins 8'! permits the pawls Iiii to be moved by their springs IOI Fig ure 6, to engage the toothed wheel I02 which thus becomes clutched to and may rotate the cycling shaft 'II. Before a revolution of the shaft TI is completed, the clutch dog 95 will be ready to intercept the latch stud 98 to stop the plate 99 again. The pawl-carrying plate I00 continues to rotate limitedly ahead of the stop plate 99 thereby causing the pawls I0! to become disengaged from the toothed drive wheel I02 and stop- When the plate pin the cycling shaft 'I'I at the end of one revolution which will have completely effected a cycle of the rest of the general operator mechanism.

including the cross bar 74. The machine as thus far described is substantially as in my co-pending application, Serial No. 72,348, filed April 2, 1936, now Patent No. 2,160,437.

The pendent rod 30 of each numeral key lever I has a shoulder so that a thereabove portion of the rod 30 may enter between two of a Series of lock rods I00 upon depression of the numeral key lever IE Said rods I05 are confined, for limited spread, in a channeled cross bar I0'I supported by he framework. Said cross bar I01 is suitably cross-slotted to admit and guide the pendent key lever rods 39. A lever I03 pivoted to the bar I0! has tongue I09 normally clear of but enterable downwardly betwen two adjacent lock rods I08.

For each set of computing pinions 45, there is a push bar III] carrying a clear sign key III. Through mechanism, not shown, depression of said push bar H0 is blocked unless all of the corresponding of computing pinions 45 stand at zero. In the latter case, the push bar I40 may be depressed and ma thereby rock an arm II2 counterclockwise, Figure 8, against the pull. of a restoring spring Iii-3. Said arm H2 has a 0I1eway driving connection I I4 to an I I5 fixed to a rock shaft Ii journaled in the framework. A latch arm I I I fixed to said rock shaft I Iii normally is under a stud I on a link H8 which is forked to straddle the rock shaft H6 and which is pivoted to a lever H9 loosely fulcrumed on a rod I29 supported by the framework. A sleeve I2I yokes said lever H9 to an arm I22 having a' link connection I23 to a lever I24 that is similar to the numeral key lever I5 and is connected to one of the type bars It. This one type bar has a clear sign printing type.

By depressing the clear sign key I I I to the Fig-" ure 8 position, its push bar II?) rocks the arm H2, and hence the rock shaft IIG and latch arm II'I counterclockwise, to the Figure 8 position. Said latch arm II'I, thus rocked, frees the link H3 and hence frees the lever H9 and its companion arm I22 for counterclockwise rotation, about the rod I20, to the Figure 8 position (full line) by a spring I20. Said spring I26 thus urges the lever I24 downwardly to actuate the clear sign printing type bar to print against the platen I9; and a cycle of the general operator mechanism is concomitantly initiated for effecting restoration of the parts as follows. Through a suitable connection, not shown, the reciprocation of one of the general operator racks I5 is converted into a full clockwise revolution of a cam shaft I28, Figure 2, journaled in the computing base. During the latter part of the revolution of said shaft I28, a cam I29 fixed thereon engages a roll I30 of the lever H9 and thereby rocks said lever clockwise to restore the clear sign printing type bar and concomitantly raise the link I 58 so that the latter becomes upheld by the latch arm III since the latter, urged by a spring I 21, tends to return clockwise to normal position. Except for the connections whereby the described operation of the clear sign printing mechanism is attended by initiation of a general operator cycle and which connections will be described later, the clear sign printing mechanism and its operation as above set forth are substantially as in the Hart U. S. Patent No. 1,190,287.

A carriage-return shaft I05, Figure 2, has a driving connection, not shown, from the same motor M that drives the cycling shaft H. A triplink I3I, when released, is moved rearwardly by spring I32 and through connections, including rock shafts I33, I34, moves a clutch-toothed pinion. I 35 along said shaft I05 into engagement with clutch teeth, not shown, on said shaft. Said pin ion I35 meshes with a rack I30 on the carriage. Carriage-return-initiating release of the trip-link I3| may be effected manually by a key--lever I31 having a link-tripping arm I30. A tappet I39 on the carriage may engage a laterally adjustable cam arm I il splined to a rock shaft I4I. Said shaft is thus rockable clockwise, Figure 2, and is effective, through. linkage I42, to restore the pinion I35, the rock shafts I33, I34 and the trip link I3! to shut on the power drive of the carriage at the end of a carriag return Carriage returning initiating release of the trip link It I may also be effected automatically by the carriage at a line end through a connection I04 Figure 2. The carriage-return mechanism thus far briefly described is substantially as involved in my aforesaid copending application, Serial No. 93,820, new Patent No. 2,128,702.

The description will now proceed more particularly with reference to the present invention.

It will be remembered that a cycle is initiated by retracting the clutch dog from the latch stud 98 of the plate 00 of the clutch mechanism. Said dog 05 has an extension. Mb engaging a pin of an arm I4! fixed to the key-lock rock shaft 9'! which has also fixed thereto another arm I 48 having a link connection I to a bell crank I50 fulcrumed on the rod I20. An arm I5! of said bell crank is operatively connected with a companion arm of the key-locking lever I08.

effective operation.

Thus retraction of the cycling dog 95 results immediately in clockwise rotation, Figure 3, of the lever I08 to lock the numeral key levers I against Conversely, the tongue I09 of the lever I08 cannot be entered into the series of lock rods I06 while a numeral key lever I5 is depressed and in that instance, therefore, the clutch dog 95 cannot be retracted to start a cycle. In other words, the register bars cannot be cycled by the general operator mechanism while a numeral key lever I5 and its corresponding unit bar 4| are depressed and engaged in setting a register-bar index pin 42.

The clutch dog 95 has a lock edge I53 under which the latch stud 98 passes when its plate 99 is released and is moved by its spring slightly clockwise of Figure 3. This blocks the retracted cycling dog 95 against restoration so that through the connections I46-I 5! the keys ar kept locked until the cycle of the shaft 11 is well under way. As a cycle gets under way and before the latch stud 98 leaves the clutch dogs lock edge I53, the locking of the keys is taken over by the following devices. The key lock shaft 91 has fixed thereto an arm I55 connected by a link I56 to a lever I51 pivoted at I59 on the framework. Normally a roll I54 of said lever I51 occupies a recess I59 in the circular edge of a disk I60 fixed to the cycling shaft 11. When the cycle gets under way and the disk I60 becomes rotated so that its circular edge opposes the lever I51, the latter and said disk edge cooperate to keep the shaft 91 rocked in key locking position independently of the clutch dog 95. The latter may therefore resume its normal position for eventually intercepting the latch stud 98 for ending the cycle.

At the end of the cycle or revolution of the shaft 11 and its disk I60, the recess I59 will be in normal position to permit the arm I55 to rotate counterclockwise, Figure 3, to normal position under the urge of a spring I62 so as to unlock the keys. Said spring I62 may be applied, Figure 3, to the lock lever I08, and a cooperative spring I6I, Figure 5, may be applied to the lever I51.

The unlocking of the keys is timed independently of the disk I60 so that it may occur only when all the parts actuated by the general operator have substantially resumed their normal positions. To this end means are involved as follows. As the general operator cross bar 14 nears the end of its return stroke, it engages a hook I63, Figure 2, on a link I64 pivoted to an arm I65 fixed to a rock shaft I66 having arms I61 connected by links I68 to a restorer bar I69 for the state control bars 19. The last portion of the return stroke of the cross bar 14 is thus accompanied by rearward movement of said restorer bar I69 to restore the state control bars 19, the latter having studs I engageable by said restorer bar. As the general operator racks reach their fully returned positions, a springurged lever I1I pivoted on the framework and partly shown at Figure 2 drops abruptly into a notch I12 of one of the racks 15. Said lever I1I thus serves, through its sudden drop and through means, not shown, to depress the rear end of the link I64 and thereby disengage the latter from the cross bar 14 whereupon a spring I13 returns the link I54 and restorer bar I69 forwardly to normal positions. This restoring mechanism for the state control bars 19 is substantially as shown in my U. S. Patent No. 2,118,860 which also describes the operation of such mechanism to restore the index pins 42.

In the present machine, a key lock control bar I14 is slotted, Figure 8, for slidable support on headed studs I15 in the framework. Said bar I14 is urged rearwardly by a spring I16 that is not strong enough to overcome the restorer-bar spring I13 but sufficiently strong to make said key-lock control bar I 14 follow the rearward movement of said restorer bar I69, said bar I14 having an upturned forward end I11 engaging the front edge of the restorer bar I69. Thus the key-lock control bar I14 moves limitedly rearward at the initial portion of the rearward stroke of the restorer bar I69 and thereby the rear end of said key-lock control bar I14 takes under an extension I18 of the lever I51 while the latter is maintained in key-locking position by the disk I60 as shown in Figure 5. Thus, said lever I51 is maintained in key-locking position until the bar I14 is moved forwardly again by restoration of the state control restorer bar I69 at the end of the return movement of the general operator cross bar 14 and thus substantially at the extreme end of the cycle. In effect, therefore, the general operator cross bar 14 and the hook link I64 cooperate as a latch device trippable by means of the lever I1I at the end of the cycle to release the restorer bar I69 and the consequent retraction of the key-lock control bar I14 releases in turn the lever key-lock lever I51 for restoration by its spring I 6|. Thus, the keylevers I5 will have remained locked until the restorer bar I69 has become restored. Therefore, no key-lever l5 and its companion unit bar 4I may be operated to set an index-pin 42 until the cycle has been fully completed and the machine is consequently in assuredly proper condition for pin setting. The lever I51 may be stopped in normal position by abutment of an arm I19 thereof with a stop I on the framework.

Operations of the described clear-sign printing mechanism, key-locking mechanism and cycling mechanism are coordinated as follows. It will be remembered that the depression of the clear-sign-key-carrying push bar IIO to the Figure 8 position rocks the shaft H6 counterclockwise to retract the latch-arm I I1 to render the spring I26 effective to rock the lever II9 counterclockwise in a clear-sign-printing stroke. Depression of said push bar II 0 is, immediately effective to lock the numeral-key levers I5 in that there is fixed to the rock shaft II6 an arm I8I connected to an upright rod I82 guided at its upper end, as in the cross bar I01, for entry between two of the lock rods I06. The lever II9 has an arm I83 for engaging a stud of an arm I84 of a lever I 85 pivoted on the framework. A stud of another arm I86 of said lever I85 engages the forward end of a thrust rod I81 that extends toward the cycle trip rock shaft 96 and is slotted so as to be slidable longitudinally on studs I88 on the framework. The rear end of said thrust rod I81 engages astud I89 of an arm I90 that in itself is rotatably loose on said rock shaft 96 but is connected by a spring I9I to an arm I92 fixed to said rock shaft 96. The stud I89 extends through a slot I93 in the arm I92 and tends to be moved into abutment with the forward end of said slot by the spring l9I which thus maintains a yieldable connection between the arms I90, I92. This yieldable connection is for the following purpose. When the clear-sign-key-push bar H0 is depressed to the Figure 8 position, the concomitant entry of the rod I82 into the series of lock rods I05 immediately closes the latter. This blocks the entry of the tongue I09 of the lever I08 into the series of lock rods I06 as is ordinarily effected by retraction of the cycling dog 95. Nevertheless, the clear-sign-printing stroke or counterclockwise rocking of the lever H9 may take place and be attended by rearward movement of the thrust rod I81 to turn the arm I90 counterclockwise on the clutch-dog rock shaft 96, and in that instance the spring I9I will merely yield and be tensioned since retraction of the clutch dog 95 is blocked by the closed lock rods 1-06. The

spring I9I remains tensioned and therefore potentially effective to retractthe clutch dog 95 inasmuch as the lever H9 remains rocked to its Figure 8 full-line position until, a cycle of the machine is effected. When the push bar H is released, and is restored to its normal position by means of the spring H3, the key-locking rod I82 is withdrawn and this permits the tensioned spring I9! to retract the clutch dog 95 since the tongue I69 may now enter the series of lock rods I06. The numeral key-levers I may thus be locked from the time the push bar H0 is depressed until the cycle for restoring the rocked lever H9 and its related parts is completed.

The relation of the carriage-return mechanism,

the key-locking mechanism, the mechanism ,for

disabling the carriage control of the computing mechanism, and the cycling mechanism will now be described.

While the carriage is being returned, the numeral-key levers I5 are to be locked against operation and the carriage control of the computi-ng mechanism is also to be disabled. It will be remembered that when the trip-link I3I is released for initiating a carriage return, the rock shaft I33 is rocked. Said shaft I33, when thus rocked, turns in counterclockwise direction of Figure 2. An arm I95 fixed to said rock shaft I33 is connected by a link I96 to a bell crank I91 fulcrumed on the framework. A link I98 connects said bell crank I91 to an arm I99 fixed to the rock shaft TI in the computing base. Thus when the shaft I33 is rocked counterclockwise concomitantly with initiating a return of the carriage, the link I98 is depressed to rock the shaft TI clockwise and thereby withdraw the latch arm 69 on the latter from the plate 68 so that the shaft 65 may rock clockwise to effect disablement of the carriage-control parts such as the jacks 98, the cam plates 39, 82, and the cycle trip lever 99, it being remembered that these parts are maintained in operative condition when the plate 63 is latched in its normal position as in Figure 2;. I

Inasmuch as a cycle of the shaft TI is necessary to eventually restore these parts to normal position, a cycle is initiated concomitantly with release of the carriage-return trip link I3I; and the accompanyin drop of the link I98 may be employed to initiate the cycle through the following devices. A rock shaft 200 is journaled in the computing base and has fixed thereto an arm 26I having a pin 292 entered in a companion slot in a coupling plate 293 pivoted to an arm 205 that in itself is rotatably loose on the rock shaft II. A spring I94, Figure 3, may connect the link I98 and the arm 20L Said arm 205 is normally positioned so that a recess 299 of said plate 203 articulates the latter to a pin 201 of the link I98. Said plate 293 thus serves as a disconnectible coupling between the link I98 and the arm 20I of the rock shaft 200. By shifting the arm 295 clockwise of Figure 3 and hence moving the plate 203 to the rear, as by setting a non-add key, not shown, an enlargement 208 of the recess 206 becomes positioned so that the plate 203 clears the link pin 201 and thus operatively disconnects the link I 98 from the rock-shaft arm 20I. However, with the plate 203 in normal position, Figure 3, the depression of the link i98 through initiation of a carriage return rocks the plate 203 down.- wardly which rocks the shaft 290 counterclockwise of Figure 3 so that an arm 209 fixed to said rock shaft 289 and connected by a link 2I0 to an arm 2| I fixed to the clutch-trip shaft .96 rocks the latter counterclockwise of Figure 3 to retract the clutch dog 95.

In a lon carriage-return run, as where a long carriage is employed, an ordinary full cycle of the shaft 11 would be completed before the car.- riage-return run is completed and therefore the computing mechanism controls such as the jacks 48, cam plates 49, 82 and cycling lever 89 would be restored and would be operable by the returning carriage before the completion of the carriage-return run. The restoration of these controls is effected during the last fourth or fifth portion of the revolution of the shaft II. Therefore, the following means are employed to delay the last portion of said revolution or cycle and effect it only in response to completion of the carriage return so that operation of the controls by the returning carriage is prevented. When the rock shaft 200 is turned counterclockwise, at the initiation of a carriage-return operation, a secondary clutch dog 2I2 fixed to said shaft is interposed into the path of a stud 2I3 on the plate 99 of the clutch mechanism. The stud 2I3 is at a greater distance from the center of the plate 99 than is the stud 98 so that the latter may pass the secondary clutch dog 2I2. Moreover, the stud 213 is short enough so that it does not tend into the plane of the primary clutch dog and thus will not be intercepted by the latter.

It will be apparent now that a cycle that is initiated concomitantly with initiation of a carriage-return operation will be interrupted when the interposed secondary dog 2I2 intercepts, as in Figure '7, the stud 2I3. This stops the plate 99 and hence, through theensuing slightly farther rotation of the shaft 11 and its clutch-pawl carrying plate I00, the clutch pawls I.0I are disengaged from the driving wheel I02. The parts are arranged so that when the cycle is thus interrupted, the shaft 1.1 will have turned from, say, three-fourths to four-fifths of its complete revolution.

The cycle remains interrupted until the carriage return is completed. It will be remembered that the carriage at the completion of its return rocks the shaft MI, Figure 2, clockwise. The

shaft I33 is concomitantly rocked clockwise so that its connections with the secondary-clutchdog shaft 209 permits the latter to rock clockwise under the urge of a spring 2| 4, Figure 2'. This retracts the secondary dog 2I2 from the stud 2I3 thereby permitting the spring-urged plate 99 to turn slightly clockwise relatively to the clutchpawl carrying plate I00 so that the clutch pawls IOI reengage the drive wheel I02 for consequent resumption of rotation of the shaft 11. Concomitantly with the described retraction of the secondary clutch dog M2, the primary clutch dog 95 is restored for intercepting the stud 98 to reopen the clutch and stop the resumed rotation of the shaft 11 When the latter has completed its final one-fourth or fifth part of a complete revolution.

During said final part of a revolution of the shaft 11, a cam stud or roll EH mounted on a disk 2I9 fixed to said shaft 11 works against a flange 2I1 of the latch plate 68 thereby turning the latter and its rock shaft 65 counterclockwise to the normal Figure 2 position in which said plate 68 becomes upheld by the latch arm 99 again. The restoration of the rock shaft 95 restores the fulcrum rods 54, 59 totheir normal Figure 2 positions and consequently the carriagecontrolled parts such as the jacks 98, cam plates 49, 82, and cycle-trip lever 59 are rendered operable by the carriage again.

The link I99 may be extended upwardly above the bell crank I91 that is associated with the carriage-return mechanism so that said link may also be operable by a bell crank 2I9 fixed to the universal shaft 31 associated with the tabulatin stop reeds 3|. Said link I98 may have a pinand-slot connection 220 to each of the bell cranks L 2I9 has the same result as described with reference to operation of the carriage-return controlled bell crank I91. Thus, at depression of any tabulating-key lever 30, the carriage-actuated controls such as 48, 49, 82, 89 are disabled and a cycle is initiated to eventually restore said controls. The cycle is interrupted by the secondary dog 2I2 and is completed only upon release of the operated tabulating key 30.

A manually operable cycling-key lever 22I fulcrumed 0n the framework, is operatively connected as at 222, Figure 3, to an arm 223 connected by a sleeve 224 to the lever I85. Thus, depression of said key lever 22I rocks the lever I85 counterclockwise and the latter, through the thrust rod I81, rocks the clutch-trip rock shaft 98 to retract the primary clutch-dog 95 to initiate a cycle. If the key lever 22I is kept depressed, the cycle will be interrupted by the secondary dog 2I2 which has become interposed with the retraction of the primary dog 95.

a spring 225 which acts on the arm I92 restores the train including the primary cycling dog 95 and its rock shaft 96 and concomitantly the secondary dog 2I2 is retracted. The interrupted cycle is thereby restarted and is concluded when the stud 98 of the clutch mechanism is intercepted by the restored primary dog 95. It will be apparent therefore that continued depression of the cycling-key lever 22I cannot cause an unwanted repetition of a full cycle. Ordinarily the cycling-key lever 22I is depressed and immediately released, this being sufficient to retract the dog 95 and thereby to release the stud 98 which immediately moves under the lock edge I53 of the dog 95; and when, in the ensuing cycle, the stud 98 has passed beyond said edge I53, the dog 95 is immediately restored by means of the Spring However, upon release of the cycling-key lever HI,

a contact 228 fixed to an insulator plate 229 mounted on a bracket 23I] attached to the framework. Another contact 23I of resilient spring material is also fixed to said plate 229 and is shaped so that it may be cammed and separated from the contact 228 by a suitably insulated cam tappet 232 attached to the clutch-mechanism plate 99. Normally, said tappet 232 keeps the contacts 228, 23I separated as in Figure 6. When a cycle is initiated by retraction of the dog 95 and the cam plate 99 consequently rotates slightly clockwise, the tappet 232 on said plate 99 leaves the spring contact 23I so that the latter springs into contact with the contact 228 thereby closing the circuit and starting the motor. A secondary insulated tappet 233 is disposed on the plate 99 to engage and separate the spring contact 23I from the contact 228 to open the circuit and stop the motor when the cycle is interrupted by means of the secondary dog 2I2 if the latter should be interposed in effective position as through continued depression of the cycling-key lever 22I or through continued depression of a tabulating-key lever 39. While the cycle is interrupted, the tappet 233 keeps the contacts 228, 23I open; but when the cycle is restarted through retraction of the secondary dog 2I2, the resultant slightly clockwise rotation of the plate 99 causes the secondary tappet 233 to leave the contact 23I so that the latter springs into contact with the contact 228 again to restart the motor.

Inasmuch as the secondary dog 2I2 may come into play to interrupt a cycle and open the contacts 228, 23I during a carriage-return operation, the motor circuit in that case is not broken but is sustained by means of the switch contacts 238 that are closable and openable as through the rocking of the carriage-return mechanism shaft I33, the means not shown, for this purpose being exemplified in my Patent No. 2,054,095.

- During an uninterrupted cycle, the secondary tappet 233 opens the contacts 228, 23! briefly, said contacts being reclosed immediately due to the continued movement of said tappet 233 through the momentum of the parts.

In the described type of machine, a key 235 and its bar 238, Figure 8, are shiftable rearwardly to condition the machine for a certain function, as, for instance, a function related to a credit balance condition, and coincidentally effect a cycle of the general operator mechanism. A spring, not shown, urges the key bar 236 forwardly and the latter is retained in its rearwardly shifted position by a latch arm 231 on the cycle tripping lever I85. Thus, in passing over the forward latching end of said arm 235, the lever I is rocked counterclockwise of Figure 3 to initiate a cycle.

At the beginning of an ordinary cycle, the latch arm 69 may be rocked counterclockwise to drop the plate 68 to disable the control of the computing mechanism by the carriage. Therefore, a roll 239 on the disk 2I6 may engage an arm of the latch arm 69 at the beginning of a cycle.

Variations may be resorted to within the scope of the invention and portions of the improvements used without others.

What is claimed is:

1. In a machine of the character described having a key movable to an operated position; a cycling mechanism, a dog shiftable from a normal position to initiate an operation of said cycling mechanism, an interlock mechanism for blocking simultaneous operation of said key and a shift of said dog, a shifter for said dog, and a yieldable operative connection, including a spring, between said shifter and dog whereby said shifter if shifted to operated position, while said key is in operated position and therefore through said interlock mechanism blocks said dog, renders said spring potentially effective for shifting said dog when said key is restored and frees said dog from said interlock mechanism.

2. In a machine of the character described having a key; a reciprocatory actuator, a lock device conditioned substantially concomitantly with reciprocation of said actuator to lock said key, means tending before the end of the return stroke of said actuator to restore said lock device, a block movable to a position to prevent restoration of said lock device, means tending to restore said block, means enabling said actuator in a final portion of its return stroke to pick up and move said block to said position, and means acting at the end of the return stroke of said actuator to release said block for consequent restoration of said block and said lock device.

3. In a machine of the character described having a key; a reciprocatory actuator, a rotary cam operable in a one-revolution cycle concomitantly with forward and return reciprocation of said actuator, a key-lock device actuated and maintained in actuated condition under control of said rotary cam during said revolution, means tending to restore said lock device, said cam during a final part of its revolution leaving said lock device free for restoration, a block movable to a position to prevent restoration of said lock device, means tending to restore said block, means operative coincidentally with a final portion of the return stroke of said actuator to pick up and move said block to said position, and means acting at the end of the return stroke of said actuator to release said block for consequent restoration of said block and lock device.

4. In a machine of the character described having key mechanism, a carriage and mechanism-controls operable by said carriage; the combination of a device conditionable to determine a power driven movement of said carriage, means responsive to the conditioning of said device to disable said controls, a power operable cycling mechanism for restoring said controls, means movable to an operated position in response to the conditioning of said carriage-movement-determining device to determine an operation of said cycling mechanism, and a key-lock mechanism having operative connection to said lastnamed means whereby the movement of said last named means to operated position to determine an operation of said cycling mechanism immediately renders said key-lock mechanism effective before said cycling mechanism operation commences.

5. In a machine of the character described having key-mechanism, a power-movable carriage and a machine control operable by said carriage; the combination of a device operable and restorable in accordance with starting and ending, respectively, a power-driven movement of said carriage; means responsive to the opera tion of said device at the start of a carriage movement to disable said control; a power-operable cycling mechanism effective within a latter portion or" its cycle for restoring said control; means movable to an operated position, in response to said operation of said device, to effect and limit operation of said cycling mechanism for the part of a cycle preceding said latter portion, said last-named means becoming restored, at the restoration of said device at the end of the carriage movement, for resulting completion of the cycle; a key-lock having a one way motiontransmitting connection from said last-named means whereby th movement of the latter to operated position moves and renders the key-lock efiective, said key-lock tending to become restored, and said one Way connection leaving it free to become restored at the restoration of said last-named means; and means cooperative with the cycling mechanism during said latter portion of the cycle to keep the key-lock eifective until the cycle has been completed.

6. In a machine of the character described, having key mechanism; the combination with a normally ineffective key lock; general-operator mechanism operable in a cycle; a cam cooperable with the general-operator mechanism for moving the key lock, and then keeping it effective during the major part of the cycle but not during the remainder of the cycle; a block movable to position to keep the key lock effective, said block tending to return from said position; means operated by said general operator mechanism to pick up releasably and move said block to effective position before said remainder of the cycle, and means operated by the general operator mechanism to release the block at the end of the cycle for consequent restoration of said block and th key lock.

HENRY L. PITMIAN. 

